How high can I fly without oxygen?

And that at cabin altitudes above 14,000 feet pilots must use oxygen at all times. And that above 15,000 feet each occupant of the aircraft must be provided supplemental oxygen. All of this is spelled out in Federal Aviation Regulations Part 91.211.



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In aeronautics, hypoxia typically results from a decompression or lack of pressurisation of the aircraft cabin. Hypoxia occurs within a few minutes if the cabin pressure altitude rises to between 5,000-6,000 m (about 16,000 - 20,000 ft).

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The order of symptoms varies among individuals: increased breathing rate, headache, lightheadedness, dizziness, tingling or warm sensations, sweating, poor coordination, impaired judgment, tunnel vision, and euphoria.

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There is no existing mechanism for the FAA to monitor if there are drone pilots, licensed or otherwise, who will fly above this altitude limit. That is well and fine until you get into a close encounter with a manned aircraft, for which you could be facing heavy penalties if the FAA can identify you as the drone pilot.

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Traveling by airplane exposes people to decreased air pressure and lower than normal oxygen levels. For most people, these changes are not noticeable.

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There are four main stages of hypoxia:
  • The Indifferent Stage occurs between sea level and 10,000 feet of altitude. ...
  • The Compensatory Stage occurs between 10,000-15,000 feet of altitude. ...
  • The Disturbance Stage occurs between 15,000-20,000 feet. ...
  • The Critical Stage happens between 20,000 feet and beyond. ...
  • ATM = Atmospheres.


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FAA encourages oxygen use for pilots on flights operating above 10,000 feet mean sea level (MSL). The regulations for flying above an altitude of 12,500 up to and including 14,000 are fairly simple. At that altitude, all crew must use supplemental oxygen continuously if the flight is over thirty minutes.

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